This tool makes it easy to create, adjust, and experiment with custom colors for the web. It also makes it easy to convert between various color formats supported by CSS, including: HEXA colors, RGB (Red/Green/Blue) and HSL (Hue/Staturation/Lightness). Control over the alpha channel is also supported on RGB (rgba) and HSL (hsla) formats.

Each color is presented in all 3 standard web CSS formats as you adjust it; in addition, based on the currently-selected color, a palette for HSL and HSV, as well as alpha, is generated. The "eyedropper" style color picker box can be toggled between HSL or HSV format.